﻿using System;
using System.Collections.Generic;
using System.Web.Mvc;
using Xpedite.Resources.Definitions;
using Xpedite.Localization;

/* Copyright (c) 2010 CBaxter
 * 
 * Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), 
 * to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, 
 * and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
 * 
 * The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS 
 * IN THE SOFTWARE. 
 */

namespace Xpedite.Mvc.Extensions
{
  internal static class ViewDataExtensions
  {
    private static readonly String ResourceDefinitionsKey = typeof(ViewDataExtensions).AssemblyQualifiedName + "(ResourceDefinitions)";
    private static readonly Object SyncLock = new Object();

    internal static void StoreDefinition(this HtmlHelper htmlHelper, IResourceDefinition definition)
    {
      Verify.NotNull(htmlHelper, "htmlHelper");
      Verify.NotNull(definition, "definition");

      ViewDataDictionary viewData = htmlHelper.ViewContext.ViewData;
      Dictionary<String, IResourceDefinition> definitions = null;

      lock (SyncLock)
      {
        if (viewData.ContainsKey(ResourceDefinitionsKey))
          definitions = viewData[ResourceDefinitionsKey] as Dictionary<String, IResourceDefinition>;

        if (definitions == null)
          viewData[ResourceDefinitionsKey] = definitions = new Dictionary<String, IResourceDefinition>();

        if (definitions.ContainsKey(definition.ReferenceName))
          throw new XpediteException(String.Format(ExceptionMessages.DuplicateDefinitionReferenceName, definition.ReferenceName));

        definitions.Add(definition.ReferenceName, definition);
      }
    }

    internal static IResourceDefinition RetrieveDefinition(this HtmlHelper htmlHelper, String referenceName)
    {
      Verify.NotNull(htmlHelper, "htmlHelper");
      Verify.NotNull(referenceName, "referenceName");

      ViewDataDictionary viewData = htmlHelper.ViewContext.ViewData;
      Dictionary<String, IResourceDefinition> definitions = null;

      lock (SyncLock)
      {
        if (viewData.ContainsKey(ResourceDefinitionsKey))
          definitions = viewData[ResourceDefinitionsKey] as Dictionary<String, IResourceDefinition>;

        if (definitions == null || !definitions.ContainsKey(referenceName))
          throw new XpediteException(String.Format(ExceptionMessages.UnknownDefinitionReferenceName, referenceName));

        return definitions[referenceName];
      }
    }
  }
}
